Wrench for insertable teeth in saws



Feb. 23, 1954 J. c. HAUGHY 2,669,886

WRENCH FOR INSERTABLE TEETH IN SAWS Filed Nov. 19, 1951 xv; 4o T 37 i I "J I 37 r m INVENTOR.

. 26 /3 y 28 JAMES C, HAUGH ATTORNEY Patented Feb. 23. 1954 Ir-2,669,886 LWRENCH lFzORJNS ERTABIZEQ'BEEIHYIN, SAWS James CJ Haughy, 'Red lAda Haughy.Thompso Blli'fl, 'Ealiii, assignor to n,-Sa.n Francisco, Calif.

.ApplicationNovember 19, .1951,"Serial No..2'57,136

%8 Claims.

"This-invention "relates to wrenchesfor' insertable tooth in" acircular saw.

Circular discsawsfor sawing large timbers and in circular" sockets in ---saw discorblade. These teeth arefrequently -chipped and broken in'use: and also must be fre- -wrench for manipulating the teeth in removal or replacement thereof is highly' desirable.

"The invention comprises a wrench for engaging *and exerting leverage on a "disc'tooth in'a rotary saw blade in which an extendedhandle'for lever- @age' is 'oifsetfrom' the planeof the saw bladewhen the wrench is in -engagement'with thetooth. "At 1 one end of the handle is an integral'retroverted fiange'd "clevis like hook at one side of *the handle, the hook being turned perpendioularto the plane of the handle and havingits terminal tongue end portion spaced parallelwith theplane of "the "handle; the *tongue and handle having alignedopenings therethrough. On the opposite -.side=of-the handle adjacent the hook there is "a spring loadedpimwhich-passes through thehook -openings and across theopeningor'cleft of the hook, thepinbeing adapted "for passing through theeye in a'saw tooth disc, -andtheretroverted flange'd portion: of the hook providing a fulcrum tc-engage in the inner arc of i the crescentof the saw tooth for exerting leverage -to rotate "the crescent in a 1 circular so'cket in which; itis mounted. The pin is supported in a frame at'sai'd opposite face of thehandle'andthe .pin is actuated into engagement through the @openings of theihook by a'coil spring mounted on :the shank ofthe 1 pin. "The pin s is moVed out of iengagement -with the wvalls o'f -thehook by==avpiv- -otally mounted lifting lever mounted pivotally zcentrallyiintermediate the ends :of the handle.

@ne :form :in which .the invention may :be .exemplifiedis described in the specificatiomherein and illustrated in theaccompanyingzdrawing .iniwhich: I Fig. 1 is a fragmentary side elevation of a saw "the several views, 18 is:

"fat 'one side of its opposite iistructure-generally indicated 23 for engagin'ga :saw. toothdisc, :aswill *besfurther described. .Ad-

hook :end the handle strip qplanecaseat n, so that the hand ,grip; portion -21 56 is spaced from the planar bladeillustrative *of' anapplication of the-inven- "tiongshowing thehandleportion' of the wrench in dotted lines.

"Fig."2.is' aside edge view of thewrench of'the :invention.

Fig. 3 is a; planuview of Figfil. Fig. 4 is a "fragmentary enlarged view of 'dtail of a p'ortionof Fig. 2, partly insection.

Fig."5 'is a plan view online"5-5"of'Fig;*4. Referring to the drawing in which like-reference characters indicate' corresponding-parts of a rotary circular discisaw blade having in its circumferential edgespaced sockets H which are open at the ,periphery iof the saw disc, each socket beingprovided withan inverted V track [2. Into these sockets are mounted insertable and removable teeth discs '3 of crescent form and having the outer arc ofthe crescent circularand grooved to conform'tothe socket tracks-I2. The inner arc of thetooth-discs is usually irregularly *arcuateasat F4. "These tooth discs may integrally includezthetooth' por tion or may havethe tooth portion-lS-asa separatelytinsertableandreplaceable memberfas *shownin' Fig.1, in which-event the tooth'is-providedwith a shank l6 grooved at an arcuateedge s'imilarlyto the tooth disc, the "tooth member being'cIamped in place in the saw blade socket by rotation o'f thetooth disci'3- onthe'jtrack l2. *The tooth disc is usually provided-withone'or more holes "I 1 therethrough for engagement bye. 1 tool for 'tightenmg' or loosening the tooth'disc in "its-mounting. If" desired, thetooth discmay also a slit I8 through itsbody't-o provide a degree ofresilienceinthe clamping of -anin'sertable tooth in'the socket. The foregoing features df a-circular Woo'd saw blade are well known.

within the 'outerperiphery of a circular saw blade fortightlyseating the tooth disc in" the socket-and in-removing it to -sharpen, repair, orrepla'cethe worn ordamaged tooth.

- The wrench of the invention comprises an "elongated handle 20 of strongstrip material'ma-v- "ing at one end a-hand grip portion Z I and having or forward end a hoo'k ,-jacently spaced from said forward opposite'or has an offset its face of a saw blade hook 23 is formed at the terminal end of said curved or angularly turned portion by hanging the strip substantially perpendicularly upon itself as at 25, and retroverting the end of the flange again perpendicularly minal tongue 26 which is in a plane substantially parallel with the plane of the curved portion 24 of the handle strip and spaced therefrom by end bridge flange 25 sufficiently to receive therebetween the tooth disc l3 of the saw. Each side wall of the hook member has a perforation therethrough indicated 21, 23 for receiving therethrough a lock pin bar 29. This hook is therefore a clevis-like member being U-shaped or horse shoe in form and having the bar of pin 29 across its opening. The pin bar 29 is reciprocable in the openings 21, 23 perpendicularly to the Walls of hook 23 and is provided at the opposite face of the handle strip with an extended shank 30 of greater diameter which has fixedly mounted thereto a flanged shoulder El at its end adjacent the hook and pin bar, the bar 29 of the pin being normally urged through the perforations 21, 28 by coil spring 32 compressed by hearing at one end against the flanged shoulder 3| and bearing at its opposite end against the cross bar or plate 33 of a pin frame M which cornprises a pair of upright relatively spaced parallel strips 3411 which are upstandingly footed on the handle member at the side face of the handle member opposite the hook. The cross bar or plate 33 spaces the strips 34a at the outer end thereof, and is securely mounted adjacently spaced from said outer end of the strips 34a by pins 33a through the strips 34a. The enlarged end portion of the shank of the pin passes snugly slidably through an opening 35 in the cross bar 33 of the frame and is guided thereby in stabilized alignment with perforations 21, 28, which are aligned with the opening 35. At the outer end of the pin shank beyond the cross bar of the frame, the pin is provided with a flattened head 35.

While the pin bar 29 is normally urged through the perforations 21, 28 responsive to the tension of coil spring 32, it must be retracted from the perforation 28 of the tongue 26 in order that the saw tooth disc may be inserted in the hook socket opening 31 for operation of the Wrench in either inserting or removing the tooth disc in the saw socket. The means for removing the pin bar 29 from the perforation 2? comprises an elongated liftin: lever 38 mounted along the handle strip and having one end portion 38a conveniently accessible to the operators hand in gripping the hand grip portion 25 of the handle. Intermediate its length this lifting lever is pivotally fulcrumed at an upraised position on the handle strip as at 39 and its opposite end is provided with a claw l0 which straddles and engages the pin 29 between the flanged shoulder 3| and the reverse face of the handle strip, the claw being normally maintained in contact with said adjato provide a terthe saw blade to rotate cent reverse face of the handle strip by the tension of spring 32.

Upon manual pressure on the hand grip 38a of the lever simultaneously with gripping the hand grip of the handle, the pin bar 29 will be lifted free of the hook socket opening 31 for insertion of a tooth disc as shown in broken lines in Figs. 2 and 4. When the tooth disc is within the socket opening 31 of the hook, manual release of the lever 36 permits the coil spring 32 to urge the pin bar 29 through the opening 11 in the tooth disc and through the openings 21 and 28 of the hook, whereupon the wrench is in position to move up or down parallel to the face of the tooth disc on the axis of said disc and either tighten it or loosen it in its socket l I. The leverage moment arm of the wrench on the inner arc of the crescent tooth disc is from the pin bar 29 in the opening H to the inner face of hook flange 25 which bears against the edge of the inner arc of the tooth disc, as indicated M for tightening a tooth disc and indicated Ma for removing a tooth disc.

The head 36 of the pin shank 30 provides a means whereby the pin bar 29 may be forcibly driven through the opening ll of the tooth disc in the event that the opening I! becomes filled with hardened resin to such an extent that the compression of coil spring 32 is not suificient to drive the pin bar through such opening, the head 35 havinga diameter greater than the spacing between upright strips 34a and width of plate 33, so that if a forcible blow is struck upon the head for said purpose the thrust of the force will be by contact of the head upon the ends of side strips 34a rather than upon the crossbar member 33.

The laterally curved or angularly turned end portion 2 in the alignment of handle 20, adjacent to the hook 23, provides for operation of the handgrip handle portion 2| within the outer periphery of the plane of the blade and the teeth of a circular saw when the wrench is gripping a saw tooth, as shown in Fig. l, and thus avoids the possible danger of injuring the hands of the operator against the sharp points of the teeth 15, which factor, taken in connection with the planar offset 22, greatly facilitates speed and safety of operation of the wrench.

Having described the invention what is claimed as new and patentable is:

1. A wrench for manipulating insertable disc teeth in peripheral sockets of circular saws, com-- prising avhandle member having a handle grip portion at one end and having at its opposite end a hook at one side of the handle, said hook having a pair of spaced substantially parallel walls connected at one end by an end bridge flange therebetween providing a hook socket open at one end for receiving therein the disc plate of a saw tooth, and the hook sidewalls each having a relatively aligned perforation therethrough spaced from said end bridge, a pin having a bar portion reciprocable through said parallel walls and through a perforation of the saw tooth disc, and means to reciprocate said pin, said handle member having a lateral angular end portion adjacent to the hok end offsetting the hook from alignment with the hand grip portion of the han dle, whereby the hand grip portion of the handle may be positioned within the outer P riphery of a circular saw when the hook is engaged with a saw tooth at said periphery.

2. A device of the character described having the elements of claim 1, and in which the handle has an offset in its plane intermediate the hand grip portion and the lateral angular turned portion of the handle.

3. A device of the character described having the elements of claim 1 and in which the means to reciprocate the pin includes a lever for lifting the pin, a pin frame mounted on the handle at the face of the handle opposite the hook and having a guide opening aligned with the perforations in the hook, the pin having a shank slidably passin through the opening in the frame providing a guide for the shank, and a coil spring mounted on the pin lifting lever and being under compression between the pin frame and the end of the shank adjacent the pin bar.

4. A device of the character described having the elements of claim 1 and in which the handle has an offset in its plane intermediate its ends, and the means to reciprocate the pin includes a lever for lifting the pin, a pin frame mounted on the handle at the face of the handle opposite the hook and having a guide opening aligned with the perforations in the hook, the pin having a shank slidably passing through the opening in the frame providing a guide for the shank, and a coil spring mounted on the pin shank and being under compression between the pin frame and the end of the lifting lever adjacent the pin bar.

5. A wrench for axially rotating a perforated disc saw tooth in a peripheral socket in a circular saw blade, comprising a handle member having a hand grip portion at one end and having at its opposite end an integral retroverted hook at one side of the handle, said hook having a pair of spaced substantially parallel walls connected at one end by an end bridge therebetween providing a socket open at one end for receiving therein the disc plate of a saw tooth, said hook walls each having a perforation relatively aligned therethrough and spaced from said end bridge, a pin having a bar portion reciprocable through said perforations and through the perforation of the saw tooth disc, spring means tensioned to urge the pin bar through said perforations and a lifting lever having one end portion extending along the hand grip portion of the handle and having its opposite ends engaging the pin for reciprocating the pin against the tension of said spring means, said handle member having a lateral angular end portion adjacent to the hook end offsetting the hook from alignment with the hand grip portion of the handle, whereby the hand grip portion of the handle may be positioned Within the outer periphery of a circular saw when the hook is engaged with a saw tooth at said periphery.

6. A device of the character described having the elements of claim 5, and in which the handle has an offset in its plane intermediate the hand grip portion and the lateral angular turned portion of the handle.

'7. A device of the character described having the elements of claim 5, and in which there is a pin frame mounted on the handle at the face of the handle opposite the hook and having a guide opening aligned with the perforations in the hook, the pin havin a shank slidably passing through the opening in the frame providing a guide for the shank, and the spring means includes a coil spring mounted on the pin shank and being under compression between the pin frame and the end of the lifting lever adjacent the pin bar.

8. A wrench for manipulating insertable disc teeth in circular saws having the elements of claim 5, and in which the handle has an offset in its plane intermediate its ends, and there is a pin frame perpendicularly upstandingfrom the face of the handle opposite the hook and comprising a pair of parallelly spaced strips and a cross-bar adjacently spaced from the free end of the strips, said cross-bar having a guide opening therethrough aligned with the perforations of the hook, the pin having a shank slidably passing through the said opening in the crossbar providing a guide for the shank of the pin; and said spring means comprises a coil spring mounted on the pin shank and being compressible between said cross-bar and the end of the lifting lever which is adjacent to the pin bar.

JAMES C. HAUGHY.

me Date Aug. 5, 1890 Number Na 433,913 Smith 

